Publications by authors named "Masashige Shinkai"

Cell transfer printing from patterned poly(ethylene glycol)-oleyl surfaces onto biological hydrogel sheets is investigated herein, as a new cell stamping method for both cell microarray and tissue engineering. By overlaying a hydrogel sheet on the cells immobilized on the poly(ethylene glycol)-oleyl surface and successively peeling it off, the immobilized cells were transferred onto a hydrogel sheet because the adhesive interaction between the cells and the hydrogel was stronger than that between the cells and the poly(ethylene glycol)-oleyl surface. Four types of human cell could be efficiently transferred onto a rigid collagen sheet.

View Article and Find Full Text PDF

To effectively treat bone diseases using bone regenerative medicine, there is an urgent need to develop safe and cheap drugs that can potently induce bone formation. Here, we demonstrate the osteogenic effects of icariin, the main active compound of Epimedium pubescens. Icariin induced osteogenic differentiation of preosteoblastic cells.

View Article and Find Full Text PDF

Bone morphogenetic protein-2 is a very promising candidate for the treatment of bone diseases and defects, but more effective therapeutic methods are required due to its instability in vivo. A controlled and localized delivery system of Bone morphogenetic protein-2 would be appropriate for effective bone regeneration. Here, we report a novel delivery system of bone morphogenetic protein-2 using vitrigel (a novel stable collagen gel membrane prepared from vitrified type I collagen) for in vivo bone regeneration.

View Article and Find Full Text PDF

To effectively treat bone diseases using bone regenerative medicine, there is an urgent need to develop safe cheap drugs that can potently induce bone formation. Here, we demonstrate the osteogenic effect of icariin, the main active compound of Epimedium pubescens. Icariin induced osteogenic differentiation in pre-osteoblastic MC3T3-E1 cells and mouse primary osteoblasts.

View Article and Find Full Text PDF

The aim of this study was to investigate the effect of Ca(2+) concentration in culture medium on the promotion of osteogenesis by MG63 osteoblast-like cells and to prepare bone-like tissues by supplying Ca(2+)-enriched medium to MG63 cells immobilized in three-dimensional gelatin hydrogels. Human osteosarcoma MG63 cells were cultured on tissue culture dish under various Ca(2+) concentrations to evaluate the effect of Ca(2+) concentration on calcium deposition. When Ca(2+) concentration was 8 mM, the maximum calcium deposition was obtained at day 28.

View Article and Find Full Text PDF

Since magnetic particles have unique features, the development of a variety of medical applications has been possible. The most unique feature of magnetic particles is their reaction to a magnetic force, and this feature has been utilized in applications such as drug targeting and bioseparation including cell sorting. Recently, magnetic nanoparticles have attracted attention because of their potential as contrast agents for magnetic resonance imaging (MRI) and heating mediators for cancer therapy (hyperthermia).

View Article and Find Full Text PDF

Human amniotic epithelial cells (HAECs) are formed from amnioblasts, separated from the epiblast at about the 8th day after fertilization. Recent studies suggest that HAECs can produce various biologically active substances. In this study, the effects of cultured HAECs on keratinocytes were investigated.

View Article and Find Full Text PDF

The goal of this work was to develop a novel biomaterial to be used for either wound dressing or as a scaffold for tissue engineering. The biodegradable hydrogels were prepared through cross-linking of gelatin with transglutaminase (TGase) in an aqueous solution. We found that the concentrations of 5 wt% gelatin and 1 unit/ml TGase were optimum for the proliferation of NIH/3T3 fibroblasts.

View Article and Find Full Text PDF

Magnetic particles for medical applications have been developed by many researchers. Since magnetic particles have unique magnetic features not present in other materials, they can be applied to special medical techniques. Separation, immunoassay, magnetic resonance imaging (MRI), drug delivery, and hyperthermia are enhanced by the use of magnetic particles.

View Article and Find Full Text PDF

Using overlap elongation PCR, we created repetitive DNA libraries encoding the elastin VPGVG and collagen-like GERGDRGDP sequences. From these libraries we isolated two repetitive DNA sequences, Col-5 encoding [(GERGDRGDP)(5)GER], and Ela-16 encoding [(VPGVG)(16)VPG]. Both proteins were expressed as thioredoxin fusion proteins.

View Article and Find Full Text PDF

Magnetic particles for medical applications have been developed by many researchers. Since magnetic particles have unique magnetic features not present in other materials, they can be applied to special medical techniques. Separation, immunoassay, magnetic resonance imaging (MRI), drug delivery, and hyperthermia are enhanced by the use of magnetic particles.

View Article and Find Full Text PDF

We developed a novel method for creating repetitive DNA libraries using overlap elongation PCR, and prepared a DNA library encoding repetitive Arg-Gly-Asp (RGD) cell adhesive motifs. We obtained various length DNAs encoding repetitive RGD from a short monomer DNA (18 bp) after a thermal cyclic reaction without a DNA template for amplification, and isolated DNAs encoding 2, 21, and 43 repeats of the RGD motif. We cloned these DNAs into a protein expression vector and overexpressed them as thioredoxin fusion proteins: RGD2, RGD21, and RGD43, respectively.

View Article and Find Full Text PDF

BACKGROUND: We have developed magnetite cationic liposomes (MCLs) and applied them to local hyperthermia as a mediator. MCLs have a positive charge and generate heat under an alternating magnetic field (AMF) by hysteresis loss. In this study, the effect of hyperthermia using MCLs was examined in an in vivo study of hamster osteosarcoma.

View Article and Find Full Text PDF

Immunotherapy (IT) has become an accepted therapeutic modality. We previously reported that intracellular hyperthermia (IH) using magnetic nanoparticles induces antitumor immunity. We undertook these studies in order to study the combined effects of IT and IH on melanoma.

View Article and Find Full Text PDF

The hyperthermic effect of magnetic particles was examined in an in vivo study of mouse B16 melanoma. Magnetite cationic liposomes (MCLs) have a positive surface charge and generate heat under an alternating magnetic field (AMF) by hysteresis loss. MCLs were injected into melanoma nodules, which were then subjected to an AMF.

View Article and Find Full Text PDF

In this study we demonstrated that heat shock protein (HSP) 70 expression by hyperthermia induced antitumor immunity in the T-9 rat glioma. Our hyperthermic system using magnetic nanoparticles induced necrotic cell death that correlated with HSP70 expression. We purified the HSP70-peptide complexes from the tumor after hyperthermia to investigate whether HSP70 was involved in the antitumor immunity, and we found that in the F344 rats immunized with T-9-derived HSP70 the tumor growth of T-9 was significantly suppressed.

View Article and Find Full Text PDF

Various kinds of hyperthermic treatment for malignant glioma had been inhibited due to both their incomplete feverish action and strict cooling effect of the brain. The author shows an effective results of hyperthermia for the treatment of malignant glioma in an in vivo study using stick type carboxymethylcellulose (CMC)-magnetite, a newly manufactured magnetite-product. A stick type CMC-magnetite, containing magnetite particles, was inserted into the T-9 glioma in the rat brain stereotactically, and the rats were exposed to an alternative magnetic field (AMF).

View Article and Find Full Text PDF

Specific heating of magnetic particles in radiofrequency (RF) capacitive hyperthermia and its hyperthermic effect were investigated in an in vivo study. Magnetite cationic liposomes (MCLs) were injected into a rat tumor on the femur and 8 MHz-RF capacitive heating was applied to the rat under "mild heating" conditions. Although the input power of RF capacitive heating was low under the same power conditions, the MCLs-injected tumor was heated over 43 degrees C, whereas it was only heated to 41 degrees C in the case of the rats not injected with MCLs.

View Article and Find Full Text PDF

A PHP Error was encountered

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessionga429e2nuhp6vbvhfootjntv5et5nagq): Failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 177

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /var/www/html/index.php
Line: 316
Function: require_once